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Ankit travels from New Delhi to Patna. He stops at equidistant places, i.e., Lucknow and Mirzapur during his journey. He covers the first 1/3rd distance at a speed of 50 km/h, the 2nd 1/3rd distance at a speed of 40 km/h and the last 1/3rd distance at a speed of 60 km/h. However, while returning, his uniform speed is 75 km/h and he stops only at Jaunpur, which is exactly at the mid-point between New Delhi and Patna. What is the average speed (in km/h) of Ankit during the whole journey, not considering his halt time?